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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e36c2864c23580ded193d0d335b54bc15f9017512eb8e9f7e0f93bcf31baab9' 
  AND token = 'lbfNMJByR2siI3wrf9nSc0XatOYvZjqy8MU4bLQCCqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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