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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577a3de964f707a417daf13f664d6287402c60701f2f8ecedef5e190cee4ae84' 
  AND token = '79ek/7/82LYzq8oyt+/ckdpV0DBCQVwEZa9kPFa0yMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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