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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239bad7f7f8f6da8eeadc58d455072e4f911bf85a952c59de7894d3f8688c3f5' 
  AND token = 'VIHIdCpTaZyCszvb81a8lVCyeLCXsRgKdDztGkCmBxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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