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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f81f4afaf938f9eddbd60c8da5ec53253a908f06cc60f290cbd0890eee57476' 
  AND token = '5WvN8Qjug/hY/BKBYcBbu5yI5dlx6UDa+h2kVYBkllo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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