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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decb8a3b59cd34304c692c6e6f986da1e35378447367a6326975085dc478fe45' 
  AND token = 'H11cV3Ej0F2cgSvw4vAcvD6ntvHxhQodCYJbNbIvcHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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