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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0864b3b0abd0470139ffd373db3854d25e724245b52012601d06334daa35b3e1' 
  AND token = '+8lxDS9YRB7W+0wT/68Sg+4d3F0TO3mwHvUSeBO/W9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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