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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8f36c38272970bf7d39f8e785a238729b2c8f56f62ae9a937d1458b1a71a87' 
  AND token = '8RUOxPTha9FCx6efu3Quh/+8f4yV8GYY1Rq2E1vTJCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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