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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd81e88b31e0844d5da37fc38e63e9f78a6614f8a867240dddeeeda967daf96a' 
  AND token = 'Tj9GDWEHEIc2bHuWTP1PmScL98Z8Iu45urDHjctTHu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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