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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a2cd80803aa763f6fee4b7a58d29c75c541e9a3c0f747df7e3b25525129779' 
  AND token = 'aUrYtz9uFOUW4RXakN5H7SxUQ9UCpbRiKVRpxlv2sgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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