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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2a10096d773e2623833d7b86c79beec1f3430fa27289aae57ad7be56f8c52e' 
  AND token = 'vFHE4wzNTiG7vrvpn69KtOjmri7TCcl/Ai4JBfrn9Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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