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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05265e6b63700f6ab55079d909018e0dbe8be5f7349b266ac2280e56c7c70d0d' 
  AND token = 'n68jYd9wSZoqg58G06gAm85oyAIdzbRIz48Hb6b+pE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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