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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab366b9cae70ceefdee5b9c536620519f8d545b917579e869400e591f119ccbf' 
  AND token = '17zSN7FeUyTQLRrNuWeH88tgxHTzg5OHm71H5o3rDCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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