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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e7699a67222bdb4ccb4a62ba3a024478316b13267c904c3b16d26914ec4c98' 
  AND token = 'ZlmalruIq1mImKkTAH7UAVImqTN2YEV0LHS1/JTl3bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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