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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65391d4c1315831da94e91c41ff20154585657badec040ac7053f49f4956390b' 
  AND token = 'KY9Q0akj0ABCF2jtj4IGgHkQPP/f0P2nOb9cG3i62RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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