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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd2fb798894809609bf89ad7a272173ebc0950630c551b48e59a1950d31cd2e' 
  AND token = 'gOZ9fLYrfZLFlVt//v77SCn4GGM9raFogMEqs3iZgJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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