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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7acd9f9eee013d51588f82ec8671abd2229aca0d1a364b23f63ea7803e72c96' 
  AND token = '/0PFnEuVq9s2+8fwdLn39UmFsVvPlg6ZPl9VWDg45LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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