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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71bc26789d27d1009827aa7a943efd5ade39b901aa46695f6c133449c4cd134' 
  AND token = '3ep/uR81fMI0b8bs/sq/UGtTF301v58ftN3KZHkowAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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