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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da70f498791c61a87074bedb6ba06ddc0f19b4d35e7b58d33dddcfc0c7c9c499' 
  AND token = 'CAPHNg0hL22picKBojxkjJ8T8OtDPDpgd3IcHVQ/5GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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