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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29eb72540d1baa0082571f13116a17351d7bd0c6746922bb4a97dab04c7ac0e' 
  AND token = '9Q0dXn1qqfyl8fJs06TJCzdL4TnQdzwcH32u1hFlrVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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