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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39c9846483e03d67ee6d11d8aa6980d8d5c9a8f819aeb57fcedb7fdcaa4ae24' 
  AND token = 'wCPj5IiH5n+rmlrg10fQFyYJS8YFQE3vQ3+cns2C/Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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