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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd7904c10e7a923ee6829e1fc7650edb61cfd05f63969effcadef90765df184' 
  AND token = 'FFNA8Pq6OL1J3W2HK6yxoXU8+ylZY5aw2sQ6mcARAKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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