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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b657c466bc767215e10ce86d8c823b47474ae370b994e5a5e389eda6f2721d0e' 
  AND token = 'AokMEIYSPs+ybjHmc4jCK8eyB52Ym4Bi6JHw/BQztA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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