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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2770c8bbfcd036f12255c9e9e2787fc3b1410749ff08c94670d40ae3ebeac197' 
  AND token = '15pQ4/qpREgHJafKuJNmvZIHcERSriAhKO0GyxXf1a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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