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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8aa1dd4aaa1cff71ed426f1702da725d644a930d5ae7141a0008da97b6766a' 
  AND token = 'l8GQgqbR49GwHJ/HpQGyDAj03kiOBjO6on2aqxNN2ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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