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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003489f30c15427fb876f692354dbd7dd291579e64f3ef4f6711007b61616f5a' 
  AND token = 'bEnyM2Z4PMdD43LOzvHZlH6YeWJ1Ex3SryGDc0TCOho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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