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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd4bc5e140ae64e71adcbb9323316ad7633ba59a0bdf163368d5fa3c7c87953' 
  AND token = 'F3e3+SmYuA7QTAxQoXiQoetCeEzVQ5w6wvk3uhkhk60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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