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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba747ab9420f5c917780550bfb859bbfd65cc1aeace39576d437a0ac291a775' 
  AND token = 'Rp4FYVsuy4wfWhlKzhNd2XZsleLC1qciuUTKKbJCqOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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