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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854ec151b4d0823f0598fbe5587e94fd05276f6f8ba15d9e1f5ea856b96be07b' 
  AND token = 'HU+QPCTmmyXOn4kNembLz/cuuegS7ZigqqS3j4W+5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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