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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e3a08af2d3604abf7a9dc008f97501842ce2bf4f80c7e201e8b634be297a3c' 
  AND token = 'Je+rGgL9cyYxreje4gf3bTZ0ENaO55xQaoVk8wvv44U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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