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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e36fba238872a3c44b02dfff9f2f2f6e42ce98409d3aa7b1d86360f194554d' 
  AND token = 'EgbpRykpdwWpDMEB+SWZg1mkW8kHTXDaixxttQb27Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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