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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484247840aa93f3cf9c20069dd2d4d722dd3ff5d1b58293f06992201861bfe61' 
  AND token = 'KTT/few0u9CyU0T/kd9lWeHaSiIVYMFWl+bjI/Mnri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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