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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d6e07fb21173c39e8517c56ecb97384f44882ae23a348ac0ff78c2fba3017' 
  AND token = 'Zyu5grAbTv9Mtoj3HnDJ7MGt01ES1xoP9Zvq1c3x98w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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