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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54aca9d0d6465b4c4daf7b8f45cf8b4cf06757166a2886ad162fc7f47ed569e7' 
  AND token = 'HEEDy+YPMCEZkjcn3PgHUu6sQZB7bWwZOO8WPzrdl/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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