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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc84067ec4d93d8e036f5380f6e1284cb2b3381a33f82d9de9e161d256614d8' 
  AND token = 'goU8rWoF18GUivfxkvI2YLb2wf1tnJkUjFsfzE5WJgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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