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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2e5599a66e74467cd6d1259b45249db330e64a5484b545c12a64f188edb7a0' 
  AND token = '2RoLkh8ezgvl2IBz8nlcBOz526GZNFCUv1ef75ppgCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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