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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034085b8e7fb3239568d50d492b0f8b538e1a71a1c9778d8fd1072c1d3f6a3ad' 
  AND token = '6cn9IR/XI2l1rH/r09+DhX+EMXbsdPUSJgxtGaWWfOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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