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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7babffba78c324345a88cb14458bdc32cc4ef3ccb3f29f22b45bed7b06b7d2' 
  AND token = 'k/V3JQlD6zb4Gp5O6+H/+LAuvRUSUFHL9lNsa2nftkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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