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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c7a998363300b84c29c80c81c1c5e9ef39473769ffd3f2cafe5eb0a7ed236f' 
  AND token = 'bkOF9m7tBJTOSvMx9GpkrhP7BG9ixm0mW9TOyPdgaEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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