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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809dbbd08e41a9048f57faeaed881c4bccd3df9fd187016eedb72ab45bc62f85' 
  AND token = 'HKlRMvUwBC/+C5MewChpjJBh4wbjFv6vHQRUNrH9axk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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