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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76461898c4c13508e3924a4a463755d6e37a871d03703fe2337acbd45c27e4c' 
  AND token = '4QlaRbP0OJurYndD4ytAhrwmYdB7q1g8rkLTa5JWLB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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