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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae687cc727e37f0555b963d30ba2592fba6c45db0d11706369f3225fd2eb80c' 
  AND token = 'z9JrwrcTJAN12/n/ZNne0QflJL+0ddWSc/sphndC+Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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