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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8248734ec6c8b6a4d3e37637275554dec753287feb90d4130674de396c36796c' 
  AND token = '9cBt+0zYFDT7lZDlN6r0a4mg0dt9ayFH1geo5gjo+C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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