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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774e7f6375ccb3bba8d4557c30f60e039fa7e2314c09f0ef0fbbb16fd128c4b3' 
  AND token = 'gyT3lI1XC0Jx1nKMhCXP/P79wfaesT+3+jFPgbBASDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}