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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a39d220ba5cff592ed4999f543c1ca2383685c14fa3a9bcf01c57e1b57768f' 
  AND token = 'AC6Moqp38DJcuXitHk0EXUiDT3UHroSE9v/7J+e7KFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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