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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0eb37bf2aaa8211fa86702fa963c4c401ccf1704cf483202d0d7cb7f6c1e1b' 
  AND token = 'u7cc3Q1Tfapqp4F6eM7MD7An2RoHwDOJgwUOKt7t+BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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