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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bdcc7d6ea18c8f0037a2543cfea5534bd2c5495d8dc16ed8fc91143c605c33' 
  AND token = '4ITWvszxfVeRmnqhMJe72mhicHhacE8SLFUpHgNyLm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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