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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7814ebb5bad68476aa7875385e7316650ba2429db7f9dcba6268665b8cb540e' 
  AND token = '53/oRFf/MQTGtGR7GQhfyJO9j1oO9mxpGSFs5092A7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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