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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13f4abd4b11843cc82e5b2371516a04201448b7b271e4f581d9496ca6706b3a' 
  AND token = '/wBhK2+KSWJW7qA9R50EFghce7hGKtRxwTIezWtarOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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