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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18f5e0b2678c9588be095c8ba8a345ad1fdd0c8a7ec8688710fe788899d1488' 
  AND token = '1tGXezb9+5zglRSaWT6fIPRUCwJbCymNLPgBBf6muYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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