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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96650d803851d65c7485d387965ae052416aceaebabf32d7ca87d94f34869af' 
  AND token = 'U0eyz4mewR/9EmAGbIDK915IP4Q7LxK9lo4weuUB3+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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