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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee2faa5b70aa6c45ffb96290b0b3c6cacd3af8531fb5c9465f299b5eb5bd8de' 
  AND token = 'aF4Tx30ImAolCi9XUV7kJiNUmFj0h4/BZ7FiYzrZXts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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