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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23e70b4df9b4c58ed4e0ba9a4ee4a270134efaacc585d8597194cfc16c43699' 
  AND token = 'nnJVJ3rkpncyIUrWdyivnPUzymnj6H8tklWyZLMP32M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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