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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32c9338f81623edb74bd4255656f779118705ccca2778945ca51f7256f70c3e' 
  AND token = 'IKmX4gcz5Geq76HOLHrwpXWzqi6cuBLwJ84R94SbmFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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