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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885859353600c07092d25eac485475865a4e2d6c1a1446365e4cac85999f6bd0' 
  AND token = 'UcCbRtW9A9T0ukZhr7vKLB+TUvQQzYKU/u67zuNIdF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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