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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc6ba0389c203c5e4d9c4c3d5847b2c69a7b616ae9ca1586f1cdd5ec02bec2a' 
  AND token = 'UJQQP7Ctrezgn3dhql6k/iYx9jsFs2kEjG5ZD8DHGSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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