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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b77df9a7f3cb93e39ede41ceded1846c41d229da6c35379a0956902551d653' 
  AND token = '1D/oq9nzuMNTAwwDv84CmED43t2uJIiem8xXEwXqZyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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