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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcbe9cfde4b074a5ddea9243b16b6295a3790541c9039aa0ee71b828f2120f9' 
  AND token = 'yPtoBEfc4dHDCFRQxXVnlPMUzZOr7ypqp2fLDlcFok0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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