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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3aa56109154ce236bf41079145b5fd5fd1a5b3119e5efb6e3d3cded1217d63' 
  AND token = '5g0Y9DJUzgGKY8oQfciDoR7YZuQ2FZT98gjw5Ee9QJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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