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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da106b0bb19184f5840969d699712c889f0613c4acbe21064528a08eb942df49' 
  AND token = 'ngCPg8wrCGcq0s/m/f9mqxFwa8zFCe5DwX9XOcqTxr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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