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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa7ce1f60a788537f5da4b6f5bf310b8b07b3f4888e4864e5e24d771ba90fe2' 
  AND token = '1kuzRHUxjY4S1OHu6uPU0Btk8QYyKnp5O6LQOexPUqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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