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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0416fa84a7cd0a7f74a380132e71eae4da25120a5187eebaa3ceea17092b42' 
  AND token = 'eEMmywfSjv6m9KVElxXpyMB0skzBEXNynClUxHrKefw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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