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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cf49b7c602b2bb9e58d1fe17dd5a5f32205768b3c4143d9fb3cbbb061d7d85' 
  AND token = 'Hw9eANmAC707BIbLNU0LzWhXd41WCzCVs5U3yxhaWTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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