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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a391891e1cae6977186a8f239b36761b9f1c97438ab9feeb2065adee25a41211' 
  AND token = 'h3tp9MBuk/CT8PN7ttCmCpCLV9+kC8q32h9mrsC8vjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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