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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d37c91d923c5c611b4ecf28f8cb120a08f236bf4ec2c05a61e4d947b249ffaf' 
  AND token = 'k9mkAmDIt82VyaPxU+o+bwgiYxVbE2hsXI3Mke7CXT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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