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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b351a19180779642201cdbb507b537dd0307351f3e680b61054e88f9bf4f62' 
  AND token = '96PkcMBM87d2QyD/V2lKhqdgKPZoQN+xDIzoXte4nso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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