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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f92475a688ce3cd9e953967860b6d6fd3163d407f72aa52707ed491e66cd529' 
  AND token = 'JN7nTyQaBA/tg61R+blj3JeXD8RS7w290icljbvbOvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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